Pump



Dec. 15, 1942'. E. 1. RUTHMAN I ,8

Filed May 8, 1940 3 Sheets-Sheet 1 INVENTOR. EDWARD J, Rurmmw A TTORNEY 1942- E. J. IRUTHMAN 2,304,849

nnuu

Filed May 8, 1940 3 Sheets-Sheet 2 III A TTORNEY II I I VENTOR.

7 5 EDWARDNJ. RUTH/WAN 1 1g 7 I fl D .15,1 E. J. RUTHMAN 2,304,849

PUMP

Filed May 8, 1940 3 Sheets-Sheet 3 JNVENFOE V EDWARD J. Rvrnmmv A TTORNEY'.

Patented Dec. 15, 1942 UNITED STATES PATENT OFFICE Y Edward J. Ruthman, Cincinnati, Ohio Application May 8, 1940, Serial N0. 334,007

Claims.

This invention relates to improvements in a pump, particularly a pump for circulating or pumping metals when in the hot molten state, such as molten solder, molten babbitt, etc.

One of the principal objects of 'this invention is theprovision of a pump, as above identified, in which means are provided for maintaining the pump shaft in a cool condition at all times to prevent the transmission of heat to the motor and parts associatedtherewith.

Another object of this invention is the provision of a pump for circultaing molten metal, which is relatively inexpensive to produce and is highly eificient in operation.

Another object of this invention is the provision of a pump, for the purpose above specified, which is relatively simple in construction and operation.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawings, forming a part thereof, and it is'to be understood that any modifications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

In the drawings:

Fig. 1 is a front elevation of the pump, embodying the improvements of this invention, with a portion of the tank broken away.

Fig. 2 is a view taken at right angles to Fig. 1 and as seen from the lefthand side of said Fig. 1.

Fig. 3 is a horizontal sectional view taken on line 33 of Fig. 1.

Fig. 4 is a horizontal sectional view taken on line 4-4 of Fig. 2.

Fig. 5 is a horizontal sectional view taken in a plane below that of Fig. 4 on line 5-5 ofFig. 2.

Fig. 6 is a horizontal sectional view taken on a plane below that of Fig. 5 on line 66 on Fig. 2.

Fig. 7 is a vertical sectional view through the pump and motor shaft taken on line 1-1 on Fig. 1.

Fig. 8 is a horizontal sectional .view through the pump taken on line 8-8 on Fig. 1.

Fig. 9 is an enlarged fragmentary elevational view of a portion of Fig. 1, showing a modification in the cooling mechanism.

Fig. 10 is a horizontal sectional view takenon line ill-J0 on Fig. 9.

. Fig. 11 is a vertical sectional view taken online V Specifically referring to the drawings, the pump of this mechanism comprises an electric motor .I 5 from which projects the motor shaft [6. The lower end of the motor shaft i6 is received in a pump housing H. The pump housing I'll, see .Figs. 7 and 8, encloses an impeller 18 carried by the lower end of the shaft [6. The upper and lower ends of the housing ll are closed by cap plates i9 and 20, each providedwith an aperture or eye 2| for supplying theinteriorof .the'hous- .endof the motor 15.

ing ll. Extending fromone side of the housing,

preferably tangentially thereof, is a discharge port 22 to which is connected in any suitable or desirable manner the discharge pipe or .conduit 23. 1

Integral with and extending upwardly from the cap plate I9 is a casting or connectinghousing 2'4, which comprises a pair of upright arms 25 and 26, terminating at their upper ends inia flange 21. The flange 21 hascentrallythereof an aperture through which the motor shaft l6 passes. Secured to the outer surface of the flange 21 is a short spacer housing 29comprisingarms 30 and 3| connecting flanges 32 and .33. The flange 32 is provided with a counter bore for an anti-friction bearing 34 for the shaft l6. Contacting with the flange 33 is the lower Suitable bolts 35 are employed for securing the pump housing I7, housingcasting M, spacer housing 29 and motor t5 to-one another to form .a unit and vertically position the motor with respect to the pump. Securedto shaft l 6 between the arms 25 and 26 are a pluralityof fans 36, each of which comprises a disc 37 having upstanding therefrom fanb1ades'38 and asleeve 39. Each ofthese fans is located in a passageway Hi formed across the motor shaft by a plurality of fins 'ILonefin being located above eachfan ilfi, and the fins beingcast integral at diametrical points {With the verticalhousing arms .25 and-26. -These sign a fqr :fiimmeiins .aii eth QQ lh P 15 315 21f V 2,304,849 I ways is around the shaft [6 and thereby dissibraced as at 18 throughout their length. Pro- V jecting forwardly from said arms, at their upper 'ends, is a pair of guides 45 and 46, each pro vided with a suitable guiding aperture 41 for guide rods 48 and 49. The guide'rods 48 and pump prior to the cooling of the metal to the. point of freezing the pump impeller [8. At the same time, there has been provided a pump. which will maintain the .pump shaft in acool state while the pump is within the hot molten metal. Y

In order to further cool the pumpshaft and to provide a definite band or zone to interrupt the,v heat flow, use is made, as shown in Figs. 9, 10: and :llyo'f a; water jacket in place of the air' cooled zone at the short connecting housing 29. This water jacket comprises a circular water i'rtight casting 61, having at diametrically opposite sides threaded apertures 68 and 69, respectively 49 have their ends threaded intogears 56 and 5j A projecting laterally of. the motor l5.

respectively, are cables 52 and 53, each passing around a pulley 54 and 55 rotatively mounted at tl ie forward ends of "projections 56 and 5-1 extending from the uppermost brace 18 of frame arms 43 and 44. The free ends of the cables 52 and 53 are attached to a counterweight. 58 adapted to operate between the pulleys 54 and 55 and the motor l5, as will later be made clear.

\fllgrwardly of the pump supportingframe, the

top 42 is provided with an opening 59 normallyclosed by a pair of plates 60 and 6|. The

' have their meeting edges re- :to accommodate the plates fifl and 6| c essed""as at 62 and 63 .housing arms 25. and 26 and shaft 16, and to substantially completely close the opening 59 around Secured to the upper ends of the guide rods 48 and 49- sewer or cooling chamber.

for supply and discharge pipes or conduits l0 and, the former of which is connected with a. suitable tap, While the latter is connected with a The lower end or bottom 12 of the casting 61 is counterbored to receive the anti-friction bearing 34 and is provided with tapped bosses "projecting interiorly of the casting. The top 14 of the casting is like-iwise provided with interiorly projecting tapped bosses I5. 7 suitable cap screws or bolts for connecting the motor I5 thereto, as well as connecting the housing 24 thereto, all as above described in making a unitary assembly of the pump [1. and

motor I5. 7

The operation of the modified construction in Figs. 9, 10 and 11 is the same as that above de- 1 scribed, except that instead of depending solely 3 v on the circulation of air for keeping the motor these parts soas to prevent loss of heat from-thetank and splashing of molten metal; The plates and 6| are retained, within the opening 59 by a supporting ledge 19 secured to the under surface of the tank top 42 around said opening. To one side of the tank opening 59,- the tank top 42 provided with a recess 64 through which the discharge pipe or conduit 23" from the pump extends. r

The operation of this mechanism is as-follows:

The metal is maintained in a molten state to 7 a heighth approximately as indicated at 65 in Fig.

1, leaving a space above the metal and below the tank top, indicated by the reference numeral 66, of an amount to accommodate the housing l1 above the molten metal; In order to insert'the pump within the tank, the plates 66 and 61 are removed and the pump disposed below the tank top, whereupon the plates 66 and 6| are replaced to closely engage the arms 25 and 26 and shaft l6. In order to lower the pump into the molten metal,. it is only necessary to vertically downwardly actuate same to a point below the top of the molten metal 65. Rotation of the motor 15 thereupon circulates the molten metal supplied to the pump housing by eyes 2| through the discharge conduit 23. Rotation of the motor l5 and its shaft l6 immediately causes operation of the fans 36 for maintaining a cooling flow of air around this shaft and stopping the travel of the heat upwardly thereof.

When itis desired to stop the flow of the molten metal, the pump and parts connected therewith,while the motor is still driving same, are raised to a position for placing the pump above the molten metal high line 65 so thatthe pump maydischarge itself and prevent any metal from remaining within the pump to freeze the pump when'the metal congeals. e

From this, it will be seen that there has been provided a pump for circulating molten metal and in which the metal isdischarged from the shaft cool, this air cooling is supplemented by the water jacket 61 and the flow of water through 1 this jacket in maintaining the shaft in a cooled condition.

What is claimed is: a 1. In a pump of the class described, the combination of a pump un'it, a motor unit, means spacedly securing the pump and motor unit to one another, including a pair of spaced arms, means connecting said arms and forming passageways between the arms located at spaced points along the spacing means, a shaft between the motor unit and pumping unit,-and a plurality of fans on said shaft, each located in a passageway. i V

2. In a pump of the class described the combination of a pump housing encircling an im: peller and having its sides open, a closure plate for each open side of the pump housing, a motor, means for connecting the pump housing "and motor comprising a pair of spaced arms'having their one ends integral with one ofthe closure plates and extending therefrom, means for connecting the other ends of the arms, and a water jacket casing having one side connected with the arms connecting means and the other side connected with the motor, and a motor shaft extending through the Water jacket and between the their one ends integral with one of the closure plates and extending therefrom, means for; con-.

necting the'other ends of the arms, and a water jacket casing having one side connected with the arms connecting means and the other side connected with the motor, a motor shaft extending The bosses 13 and 15 each receive through the water jacket and between the spaced arms, additional meanscarried by said'arn'isb f tween the housing closure plate and the arms connecting means for forming passage ways ing a top and containing molten metal, a pump adapted to be submerged in the molten metal, a motor for driving the pump and located above the tank top when the pump is submerged, spacing means located partly above and partly below the tank top for connecting the motor and pump, a shaft between the motor and pump and disposed centrally of the spacing means, said spacing means including a pair of spaced arms, means for connecting the arms at spaced point above the tank top when the pump is submerged to form air passage ways transversely of the shaft, and a plurality of fans carried by the shaft one in each transverse air passage way for causing an air circulation therethrough,

I 5. In a mechanism of the class described for circulating molten metal, comprising a tank having a top and containing molten metal, a pump adapted to be submerged in the molten metal, a motor for driving a pump and located above the tank top when the pump is submerged, spacing means located partly above and partly below the tank top for connecting the motor and pump, a shaft between the motor and pump and located centrally of the spacing means, said spacing means including a pair of spaced arms extending from the pump and having their ends, remote,

from the pump, connected to one another, and a water jacket casing having one side connected to the arms connecting means and the other side connected to the motor, additional means connecting the arms at spaced points between the tank top and the upper ends thereof to form air passage ways transversely of the shaft, and a plurality of fans carried by the shaft one in each air passage way for causing an air circulation therethrough.

EDWARD J. RUTHMAN. 

